UU mt blend

Abstract
Author	raffriff42
Version	1.1
Download	UU_mt_blend.avs
Category	Layering
Requirements	*YV12, RGB24, RGB32
License
Discussion	Doom9

Blend (Overlay, Layer) two clips using MaskTools. Wide selection of blend modes. YV12 sources are supported, but the result may be unexpected. Use RGB sources for correct blending. Unlike Overlay and Layer, there is no support for Masking.

Requirements

• AviSynth 2.6 or later
• Supported color formats: YV12, RGB24, RGB32
• Color format of the two clips must match.

Required Plugins

• MaskTools2

Syntax and Parameters

uu_mt_blend(clip C, clip D, float "opacity", string "mode", int "cmode", bool "showargs")

clip  C =

Base clip.

clip  D =

Overlay clip.

float  opacity = 1.0

identical to the Overlay opacity parameter:

0.0 = no effect; the base clip appears normally.

1.0 = maximum effect.

string  mode = "blend"

Mode	Description
Normal Blending Modes
blend	This is the default mode – ordinary transparent blending.
Darkening Modes
darken	Use overlay only if the overlay is darker than the base image.
multiply	Darkens the image in proportion to Overlay lightness.
cburn	aka color burn. Darker than Multiply.
lburn	aka linear burn (darken)
subtract	aka Overlay mode="subtract"
Lightening Modes
lighten	Use overlay only if the overlay is lighter than the base image.
screen	Lightens more strongly.
cdodge	aka color dodge. Brighter than the Screen blend mode.
ldodge	aka linear dodge or add (lighten)
divide	Lightens the image in inverse proportion to Overlay lightness.
Contrast Modes
overlay	Uses a combination of the Screen blend mode on the lighter pixels, and the Multiply blend mode on the darker pixels.
softlight	Uses a combination of the Screen blend mode on the lighter pixels, and the Multiply blend mode on the darker pixels.
hardlight	Uses a combination of the Linear Dodge blend mode on the lighter pixels, and the Linear Burn blend mode on the darker pixels.
pinlight	Uses a combination of the Lighten blend mode on the lighter pixels, and the Darken blend mode on the darker pixels.
vivid	aka vivid light
linear	aka linear light. Uses a combination of the Linear Dodge blend mode on the lighter pixels, and the Linear Burn blend mode on the darker pixels.
gextract	aka Gimp GrainExtract, Subtract (darken)
gmerge	aka Gimp Grain Merge.
Inversion Modes
exclude	Blending with white inverts the base color values; blending with black produces no change.
Cancellation Modes
absdiff	Absolute difference: identical pixels are black, non-identical pixels are brighter in proportion to the difference.
absdiff4	Absolute difference, exaggerated 400% to view small differences clearly.
absdiff16	Absolute difference, exaggerated 1600% to view small differences clearly.

int  cmode = 2

identical to the MaskTools U and V parameters:

• -255..0 : all the pixels of the plane will be set to -x (-128 = gray)
• 1 : the plane will not be processed. Content will be invalid.
• 2 : the plane of the first input clip will be copied (the default)
• 3 : the plane will be processed with the processing the filter is designed to do.
• 4 : the plane of the second input clip will be copied.

(does not apply if sources are RGB)

bool  showargs = false

If true, shows the MaskTools expression being used. For Masktools geeks.

External Links

1. Photoshop Blend Modes Explained by Robert Thomas
2. GIMP Concepts: Layer Modes
3. Doom9 thread with some examples.